13. San Diego, CA
Flight costs: $378 (from New York)
Attractions: Summer concerts, free movies, beach bonfires, art fests, street fairs, cook-off festivals, family fests
Whatever your interests are, you are sure to find that floats your boat in San Diego. The city has so much more to offer you in summer apart from Sea World. They also have free summer concerts, free movies, so many festivals like the Festival of the Bells, RB Alive Street Fair, and so much more.
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